Removing wxNET as it's Dead

The wxNET description was duplicated. One here and another one in Dead Toolkits page. As the Project is still dead (no updates since 2011), it shouldn't be here.
Merge pull request #65 from thiagoabreu/patch-1

Removing wxNET as it's Dead
Merge http://github.com/mono/website into gh-pages

Conflicts:
	docs/gui/gui-toolkits.md
Applying pull request's corrections